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Prev Professional Automotive Repair Technical Discussions for November 8, 2007
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Open Help Requests for GM
Help Request Answers
2003 Buick Regal LS 3.8L security lamp VIN: 2G4WB52K03
Greetings all, help!!? This '03 lesabre has a code b2958 and security lamp on all the time, car runs fine, cannot clear code. Google says (because no one else seems to have any info) b2950 is "security system sensor data circuit high" . I have no clue which se...
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2003 Buick Century Custom 3.1L Surge VIN: 2G4WS52J13
HELLO TO ALL,We have this Buick with a 3.1L engine that's low on power just off idle and then kicks in fine at about 3k rpm or down shifting to a lower gear. No codes and all looks good on the Data screen, fuel pressure good, all new tune parts and filters. It...
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1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52YTU
Hello all; I have this caddy with a p1645, I ran through the diagnostic chart and I got to (replace purge sol. ) so I did. I cleared codes and started the car and after it runs for 30 seconds or so it puts the light on and sets the same code. I have over 10 vo... Trouble codes: 01645 (purge control problem)
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1997 Cadillac Seville STS 4.6L Check Oil Level VIN: 1G6KY5294V
Vehicle Keeps Flashing Chceck Engine Oil Level. Oil Level is Ok? Shop Key has no diagnostic info on this. Car runs ok under wide open throttle it shows a code p0131-mass air flow. Temp is at 208 and no fans come on. coolant level is ok. never low. I have heard...
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1993 Chevrolet K1500 Cheyenne 5.0L Poor Fuel Economy, Lack of Power VIN: 2GCEK19H6P
Customer complaint is that it has no power and poor fuel mileage. The main problem that we have is that the knock retard PID shows 20 degrees even with the engine not running. With engine running at all RPMs it reads 26 degrees. We can't get anymore than 21 de...
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1997 Chevrolet C3500 Cheyenne 6.5L No Start, MIL Lamp on VIN: 1GCHC39FXV
Any thoughts would be helpful, Customer came in for a transmission service after dropping the pan found debris in filter customer wanted it rebuilt since he travels in this with his cab over camper after rebuilding and installing it tech went to start it and i... Trouble codes: P0251 (Injection Pump Cam System), P0370 (Timing Reference High Resolution)
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1999 Chevrolet K2500 Suburban 6.5L Excessive Emissions, MIL Lamp on, loud VIN: 3GNGK26FOX
Help Thes Nice people took their truck to the wrong shop and now a nightmare has been born, When I got this truck it was the loudest engine i have ever heard (it sounded like spark knock to the extent that the motor was comming apart). was told it was a creat ... Trouble codes: P216
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2000 Chevrolet S10 2.2L MIL Lamp on, No communication VIN: 1GCCS1453Y
This S-10 is a flex fuel vehicle. The fuel composition sensor has shorted 12v back to the pcm and caused the pcm to fail, wires to burn, and all of the expected issues from a failed pcm. The customer is unwilling to put the $1400 into a complete repair. My q...
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2000 Chevrolet Cavalier LS 2.4L No Start VIN: 1G1JF52T1Y
Good evening all. Customer stated that car would start and stall, then crank and no start, had car towed. Engine will run by adding fuel to throttle body. Injector pulse width ranges near 1.8-2.2 ms, found that by disconnecting MAP sensor pulse width goes to a... Trouble codes: P0336 (CKP Sensor Out of Range), P0621 (Generator Lamp L Circuit Control), U1000 (Class 2 Serial Communication Problem)
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2001 Chevrolet Silverado 1500 5.3L long crank cold VIN: 2GCEK19T71
on initial start attempt,fuel psi slow to build and will not hold psi. dead head fuel pump no drop, has new fuel psi regulator no change. dead head return and still drops. suspect an injector but does not hydro lock or give any syptom of leak down into cylinde...
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2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V41
We have this truck that sets bank 2 lean code.Freeze frame data shows bank 2 long term fuel trim at +25%...short term bank 2 and long and short for bank 1 are normal.Code was set at 159 degrees at idle not moving.Checked fuel pressure regulator for leakage,spr... Trouble codes: P0174
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1994 GMC K2500 Suburban SLE 7.4L Excessive Emissions VIN: 1GKGK26N7R
HEY GUYS! THIS TRUCK CAME IN FOR SMOG FAILURE,(NOX)AND TIMMING OFF [...] set to 0. Reset timming to 4"before. failed 15mph at 1337ppm/ failed 25mph at 1012ppm. lambda test results were 1.001 at both speeds. we replaced cat.(w/ heavy duty afkt.type)now teste...
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1997 GMC Jimmy SL 4.3L Stall VIN: 1GKCT18W5V
vechile stalls on hard accleration blow ecm fuse replace fuse starts okay
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2001 GMC Sierra 2500 HD SL 6.6L No Start VIN: 1GTHK23131
greetings guys got a 6.6 duramax sits more than 15 minutes will not start unless ether is usedfirst transfer pump on top of filter gets soft but even if you pump itup still no start fuel pressure reading on guage is 0 in alldata they show pump on rail like the...
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2003 GMC Savana 2500 4.8L Steering/Brakes VIN: 1GTGG29V33
Here's a good one for you GM nuts and front end specialists. Customer brought in this van to us with a violent vibration/shimmey on the highway about 50mph. I drove van for about 25 miles at various speeds (45-80mph)and could not duplicate.I called customer he...
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2003 GMC Sierra 3500 SLE 6.6L long crank VIN: 1GTJK33113
hwy guys , i have been servicing this truck and 8 other trucks in this fleet for about five years now. we have reecently had a ton of issues with the trucks dtalling and not starting until the fuel system was primed. ( these are all at random issues ) the truc...
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1998 Oldsmobile Aurora 4.0L dash lights VIN: 1G3GR62C3W
olds techs I have an aurora here that has dash lights inop most of the time.The center consul lights ( radio/ heater controls ) are on until its put in gear then they go off and might come on when your driving.Sitting there on until you turn the headlights on ...
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1998 Oldsmobile Intrigue GL 3.8L abs VIN: 1G3WS52K6W
Hi guys, we have a olds intrigue that came in after someone installed new brake lines in the rear both sides (diagonaly split sytem)problem is we cannot get any line pressure to rear calipers. performed reset procedure outlined in alldata to no avail. Can moto...
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2001 Oldsmobile Alero GL 3.4L Misfire VIN: 1G3NL52E11
This vehicle came in & the customer complained of an intermittant miss but no service engine light & no codes. Test drove car about 50 miles before it missed & only # 1 cylinder is showing any missfire. After about another 50 miles the check engine light final... Trouble codes: P0300 (Random Cylinder Missfire- 1 cyl missfires intermittantly)
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1996 Pontiac Sunfire SE 2.2L cranks wont fire VIN: 1G2JB1247T
hello to anyone who reads this this car cranks ok but no spark or fuel pulse no crank rpms to the scanner first tested the crank and cam sensor signals at the pcm both signals are present while cranking but i dont know if they need to be alingned at any certai...
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2000 Pontiac Firebird 3.8L security light VIN: 2G2FS22K0Y
not sure where to start on this one? security light stays on all the time. security system will arm and disarm but light wont go out. have no knowledge of prior tests or repairs made.also customer complaining about turn signal failure from either right front b...
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2004 Pontiac Grand Am GT 3.4L Cooloing Fans VIN: 1G2NV12E84
Car will run at normal temp at idle for hours. As soon as you drive the car for about 30 minutes it starts to heat up. The high speed fan never seems to come on and i do not know what temp they are supposed to come on at. When you activate AC or Defrost the lo...
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Fixes & Summaries for GM
Fix/Summary Answers
1983 Cadillac Eldorado 4.1L Hesitation VIN: 1G6AL5782D
THanks to all who replied. We threw the kitchen sink at this one! We removed the EGR and cleaned the passage, we did the ground wire updates, did a Motorvac and we replaced vacuum hoses. Reset timing and cleared all codes. We are and our customer is very happy...
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1989 Cadillac Eldorado 4.5L Excessive Emissions, Poor Fuel Economy VIN: 1G6EL1152K
Thanks to all who sent info on this problem. I am ashamed to say I couldn't see the trees for the forest. After checking power and ground integrity at ecm,no problem there. Hooked up a used map sensor from a chevy to another vacum source and it ran normal.Then...
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1982 Chevrolet Corvette 5.7L No Start VIN: 1G1AY8782C
I PROCEEDED TO CHECK PWERS AND GROUNDS AGAIN AT THE ECM WITH A VOLTMETER,I ALSO HAPPENED TO HAVE MY TEST LIGHT NEAR BY AND WHEN ICHECKED MY KOEO POWER AT ECM I TOUCHED MY VOLT METER PROBE WITH THE TEST LIGHT I NOTICED I WOULD LOSE THE VOLTAGE.I PERFORMED A VOL...
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1994 Chevrolet C1500 5.7L 1-2 shift VIN: 2GCEC19K3R
Thank you for all of the useful information. After teardown, we found two problems other than 13 years of sludge. The band (2-4) had several cracks in it and was just worn out even though we had 4th. I attribute that for most of the problem. The overrun hu...
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1995 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G1WX12X4S
THANK YOU PEOPLE FOR ANSWERING MY POST.I REPLACED THE LOWER INTAKE MANIFOLD GASKET,AND THAT SEEMED TO MAKE THE PROBLEM WORSE.I THEN RECHECKED THE BASICS.I TOOK THE IGNITION MODULE DOWN TO A PARTS STORE TO HAVE IT CHECKED OUT.THEY SAID IT WAS GOOD.RECHECKED ALL... Trouble codes: 117 (coolant temp too low).
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1995 Chevrolet C1500 5.0L Surge, VIN: 1GCEC14H9S
First let me say that I am sorry for the misinformation in my original post. The two truck are a 95 and a 94 not 96 and 95. Since the problem has been bugging me for a few weeks I posted from a faulty memory so got the fuel pressures wrong as many of you point...
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1998 Chevrolet Malibu LS 3.1L Shift solonoids VIN: 1G1NE52MXW
Hello To all again First I want to thanks the techs that offerd help and also iatn for having a wonderful site. I was leary with this one coz I hardly change computers on many cars. Its not like before when U pop in a PCm and no programing was neede...
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2001 Chevrolet Blazer LS 4.3L fuel guage fluctuates VIN: 1GNDT13W81
thanks again for your help after checking ipc ipc connector ign switch all ckecked ok i replaced sending unit again everything working ok now
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2002 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Surge VIN: 1GTHK29102
Thanks for all your help. Found fuel pressure regulator bad & 3 injectors. Also found glow relay bad. GMC is goodwilling all injectors replacement but not regulator & relay. They extended warranty on 02 GM injectors.
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2002 Chevrolet Trailblazer LS 4.2L Transfer case VIN: 1GNDT13S62
We had some good help on this one. We pulled the transfer case and the vent was dry. The fluid was leaking past the input shaft seal into the transmission. The transmission was then overfull and was puking (ASE technical term) out the vent and down the left si...
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2005 Chevrolet Avalanche 1500 LT 5.3L Rear lift gate VIN: 3GNEK12Z65
Ok Thanks for the help guy's mitchell actuly outlines it.. My bad you have to remove the rear spoiler double edg tape holds it on.. So heat gun pry than cleaning off all the old tape next time i think i will sell a new spoiler with handle replacement T...
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1996 GMC K2500 Suburban SLE 5.7L convertor VIN: 1GKGK26R7T
vech fixed, R&R valve body sent out for overhaul with the repair of the worn out tcc apply valve bore and stage 1 shift kit.. shift nice and firm and no tcc slipage or lack of engagement. Thanks to all Adam
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2003 GMC Sierra 1500 SLE 4.8L Brake lights VIN: 1GTEK19V53
Found 3rd brake lamp relay stuck on. It had not melted the fuse/relay box yet luckily. Many thanks to ALL who replied to this post.
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1999 Oldsmobile Alero GLS 3.4L No Start, Poor Idle Quality, Stall VIN: 1G3NF12E0X
Finally we got this vehicle to exhibit all of its symptoms. It started fine, idled high (about 2400 rpm), but smoothly. When moving the transmission selector to any gear but park or neutral, the engine would start running rough and die instantly. You could mov... Trouble codes: P0122 (TP or APP Sensor 1 Circuit Short/Low), P0123 (TP or APP Sensor 1 Circuit Open/High), P1121 (TP Circuit Intermittent High Voltage), P1122 (TP Circuit Intermittent Low Voltage), P1626 (Anti-theft System Fuel Enable Circuit).
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2002 Oldsmobile Silhouette Premiere 3.4L Wireless Headphones VIN: 1GHDX13E12
Called Delphi - found out this entertainment system was made by Visteon. Called the company that exchanges/repairs the units for GM. Was told problem lies in the circuit board and all they do is exchange the complete unit. Then they replace any bad circuit boa...
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2003 Saturn Vue 2.2L code set for rad. fan VIN: 5GZCZ23D23
Thanks to you Guys and your help on the PCM stratgey explination I decided to plod on with diagnostics even though I don't have bidirectional controls for Saturn on a Modis and fixed this one. What it came down to was there are two wires that the PCM uses to t...
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